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BIOCHEMISTRY MCQs

Total Questions : 44 | Page 4 of 5 pages
Question 31. A base is a substance that
  1.    does not release any ions when dissolved in water
  2.    releases Hydrogen ions when dissolved in water
  3.    releases Hydroxide ions when dissolved in water
  4.    All of above
 Discuss Question
Answer: Option C. -> releases Hydroxide ions when dissolved in water
Question 32. Water molecules are
  1.    cohesive
  2.    adhesive
  3.    nonpolar
  4.    fatty
 Discuss Question
Answer: Option C. -> nonpolar
Question 33. Butter is an example of a
  1.    carbohydrate
  2.    unsaturated fat
  3.    saturated fat
  4.    protein
 Discuss Question
Answer: Option C. -> saturated fat
Question 34. What is the purpose of an enzyme?
  1.    block an unwanted chemical reaction
  2.    create activation energy
  3.    cause or speed up a chemical reaction
  4.    permanently bond with a substrate
 Discuss Question
Answer: Option C. -> cause or speed up a chemical reaction
Question 35. Where do substrates bind on an enzyme?
  1.    voltage-gated channels
  2.    surface receptor
  3.    calcium channels
  4.    active site
 Discuss Question
Answer: Option D. -> active site
Question 36. Made of glycerol and fatty acids
  1.    Carbohydrates
  2.    Lipids
  3.    Proteins
  4.    Nucleic Acids
 Discuss Question
Answer: Option B. -> Lipids
Question 37. The energy needed to start a reaction
  1.    activation energy
  2.    adhesion energy
  3.    chemical energy
  4.    cohesion energy
 Discuss Question
Answer: Option A. -> activation energy
Question 38. Which of the following statements about enzymes is NOT true?
  1.    enzymes are reusable
  2.    enzymes work best at specific pH and temperatures
  3.    enzymes are lipids
  4.    enzymes are proteins
 Discuss Question
Answer: Option C. -> enzymes are lipids
Question 39. Why does ice float?
  1.    As water freezes, it expands and its density decreases.
  2.    As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
  3.    As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
  4.    As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
 Discuss Question
Answer: Option A. -> As water freezes, it expands and its density decreases.
Question 40. How do enzymes speed up a reaction?
  1.    increase the activation energy
  2.    lower the activation energy
  3.    they add heat to the reaction
  4.    they decrease how many reactions can take place
 Discuss Question
Answer: Option B. -> lower the activation energy

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